Cam-actuated lathe



March 3, 1931. E. R. sMlTH ET AL CAM ACTUATED LATHE 8 Sheets-Sheet l Filed March 3, 1926 March 3; 1931. E. R. sMrrH ET AL CAM ACTUATED LATHE Filed March 3, 1926 8 Sheets-Sheet 2 NWN March 3, 1931 E. R. sMm-l E'r Al.

CAM ACTUATED LATHE Filed March I5, 1926 8 Sheets-Sheet 5 March 3, 1931. `la. R. SMITH E'r AL 1,794,423

CAM ACTUATED LATHE Filed March 3, 1926 8 Sheets-Sheet 5 March 3, 1931. E; R. Mm-l ETAL 1,794,423 n CAM ACTUATED LATHE Filed March 3, 1926 8 Sheets-Sheet 6 March 3, 1931. E, R, SMITH ET AL 1,794,423

CAM ACTUATED LATHE Filed March 3, 1926 8 Sheets-Sheet '7 Illmw 1 I I a I @f muy;

257 ezrf- March 3, 1931.

E. R. SMITH ET AL CAM ACTUATED LATHE Filed March 5, 1926 8 Sheets-Sheet 8 NN @N Patented Maro 3S, 1931 i enterar ortica niowiN sinirn AND RICHARD A.. ASHTON, or SENECA.` FALLS, .New YORK, Asro snNnCn FnLLs MACHINE Co., onY SENECA. FALLS, NEW Yoann, e. Con- PQRATON OF MASSACHUSETTS CAM-ACTUATED LATHE vAplolcattm filed March 3, 1926. lSerial No. 92,030.

This invention relates'to a latheadapted for turning cylinders or other work and particularly designed for producing duplicate pai-ts in large quantities.

lt is the object of our .invention to improve the construction of such lathes in many important respects, therehy producing increased speed and eticiencyyand enabling` the operator to turn out duplicate parts very rapidly. c y

WV ith this general object in view, important features of our invention relate to the provision of direct-acting calm mechanism for moving the tool carriage axially of trie lathe;` to the provision ot additional directacting cani mechanism for moving the tool slides toward and from the work; to the provision-of automatic devices pr changing the speed ot the work spindles at desired points.

in the operation oi"- the lathe and also for increasing the speed of the actuating cams duringthe idle or return n'iovements of the tool carriage. `We have also provided means for automatically stopping the machine at a given point in the operation thereof and we vhave provided a safety release device to prevent injury to the driving mechanism of the machine in the event of accidental obstruction to the movement of the tool carriage.

Our invention also relates to certain arrangements and combinations of parts which ywill be hereinafter describediand more particularly pointed out in the appended claims.'

A preferred form or" the invention is shown in the drawings inwhich F ig. l is a trout elevation of our improved machine lli 2 is an end view, looking in the direction of the arrowv2 in Fig. l; 1

3 is a partial plan view. looking in the direction of the arrow 3 in Fig. l;

Fi -l is a partial front view, broken away to show the starting and stopping mechamsm;

Fig. 5 is a partial plan view, taken along the line 5 5 in Fig. 2; y

wie 6 is a partial sectional end elevation7 i 3, taken. along the line SW6 in Fie'. 5 5` 'along 'the line lll- Fig. 7 is a detail plan view, taken along the line it? in Fig. 6;

Fig. 8 is a partial plan view, taken along the line@ S inllligs. 2 and 6;

F 9 is a partial sectional front elevation, showing particularly the worm shaft driving the actuating cams and ytaken along the Vline 9-9 in Fig. 2;

Fie.' 10 is a detail sectional view, taken al ng V"'lie line l0e-l0 in F 9;

. ll is a sectional plan view', taken along Y l? is av development oi the surface o the cams shown in Fig. 16.

General outline of Htc macvtae Referring to the drawings, we have shown a. lathe comprising` a traine A having a work driving head B., a. tail-stock C anda tool carriage D'. rlfhe tail-stock C is mounted in guideways for axial movement on the traine A and is in general ofthe usual construction. The tool carriage D (Fig. 16) is mounted on a guide-way 2O and a steel gib 2l and is movable axially of the lathe by a mechanism to be described.v A clamp 21a holds the carriage in position on its guideways. This construction'leaves the `rear upper .part of the iraniefree tor other attachments. i

The work'VV (Fig. 3) may be supported upon centers 23 and 2liin the head stock B andthe tailstock C respectively and is engaged by tools T secured in cross slides 25 mounted 'for transverse movement in the tool carriage D by 'special cross feeding mechanism to be described. The head center 23 is mounted in a work spindleBO and the work may be provided with. @0g 3l Ot any convenient forni by which driving engagement with the spindle may be effected.

Spindle Z'z'm'ng mechanism 7e will now describe the mechanism for driving the work spindle 30. A motor 32 (FigY 2) is mounted on the` frame A and is connected by a belt 33 to a pulley 34 which. is loosely rotatable on a main drive shaft 35 (Fig. 4). A clutch operating ring 36 is slidable on the shaft 35 to control the disc clutch assembled iii the hub 34a of the pulley 34 for driving the shaft 35. The ring 36 is positioned by a yoke lever 37 on a. cross shaft 38 having an arm 39 connected by an adj ustable link 40 to an arm 41 on a starting shaft 42. A second arm 43 on the shaft 42 is engaged by aspring 44 attached to a fixed point on the frame A. This shaft 42 isy also prozofvided with a handle 45 for actuating the clutch.

The handle 45 .has a lateral projection 46 with a lock plate 47 fixed thereon in position for engagement by a lug 48 on an arm 49 which is mounted on a cross shaft 50. A stopping handle 51 is also mounted on the shaft 50 and is provided with a. compression spring 52 which normally moves the handle 51 upwardly, carrying the lug 48 to a position to engage the lock plate 47.

When the starting'- handle 45 is depressed to engage the clutch 36, the lock plate 47 will be caught by the lug 48 and the lathe will remain in operation until the stopping handle 51 is depressed to release the clutch. Frovision is also made for automatic release of the clutch, which mechanism will be hereinafter described.

The main drive shaft 35 (Fig. 6) is. provided with a. pinion 55 engaging a fast on an upper drive shaft 57 (Fig. 5) pinion 58 is keyed to the shaft 57 and ene'a a gear 59 on an intermediate shaft 60. i gear 61 on the shaft 60 engages a large gear on the work spindle 30. A continuous low-speed drive is thus provided between the main drive shaft 35 and the work spindl 39.

An additional gear 63 is loosely mounted on the upper drive shaft 57 and is provided with clutch member 64 positioned for engagement by a second clutch member 65 keyed to the shaft 57. A yoke lever 66 is mounted on a ver ical shaft 67 and is provie ed with means by which the yoke may be f-rliifted automatically to cause the clutch members 64 and 65 to engage, thereby rotating the spindle 30 at a higher speed, as the ratio between the gears 63 and 61 is greater than the ratio between the pinion 58 and the gear 59.

rihe gear 59 is secured to the intermediate Vshaft 69 by a ratchet clutch which permits the shaft 60 to over-run the gear 59, when the shaft is rotated at higher speed.V Fife have thus provided a second driving connection between the main shaft 35 and the spindle 30, by which the spindle may be rotated at a higher speed than would take place through the gear train first described.

0am shaft dri/Ue vWe will now describe the connections for driving the cams which actuate the tool carriage. For this purpose, we provid-e a worm 70 (Fig. 5) on the intermediate shaft 60 previously described. The worm 7 O meshes with ka worin gear 71 (Fig. 6) on a vertical shaft 72 connected by bevel gears 73 and 74 (Fig. 8) to a lower intermediate shaft V75. A pinion 76 on the shaft 75engages a gear 77 on a second intermediate shaft 78, which latter shaft is provided with a gear 79 engaging a gear 80jloosely mounted on a worm shaft 81 and connected thereto by an over-running ratchet clutch mechanism to be described and shown in detail in Fig. 10.

A worm 82 on the shaft 81. engages a large worin wheel 83 (Fig. 11) on a'short shaft or stud84. A pinion 85 is fixed to the worm wheel 83 and engages gears 86 and 87 on a pair of cam shafts 88 and 89 to Which are secured the carriage actuating cams 90 and 91 13). rlhese cams oppositely engage a cam roll 92 mounted on a bracket 93 secured to a pull rod 94 which is slidable axially in the machine frame A and'which is suitably connected to he tool carriage D for moving vthe carriage along the guide-ways 2O and 21 previously described. The pull'lrod 94 may conveniently be made in two parts threaded together as indicated in Fig. 13.

Safety device The worin shaft 81 (Fig. 9) is also preferably niade in two parts connected by clutch members 96 and 97 having co-operating teeth on their engaging fac-es. The member 97 is slidable on the shaft 81 and is pressed yieldingly toward the member 96 by springs 98,

Vone of which is shown in Fig. 9.

The position of the clutch member l97 is controlled by a yoke lever 99 connected by a link 100 to a release handle 101 (Figs. 1 and 2). By swinging the handle out-ward, the yoke lever 99 may be moved to the left in Fig. 9, thus separating the clutch members 96 and 97 and stopping the rotation of the carriage-actuating cams 90 and 91.

It is often convenient to thus disconnect the carriage drive, when it is desired to separately move the spindle without corresponding movement of the carriage. This yielding clutch connection between the two parts of the worm shaft 81 also permits the parts to slip, in case further movement of the carriage is obstructed and thus prevents breakage of the driving mechanism.

Clutch construction The over-running clutch between the gear vor,

and the shaft`81 is shown in detail in Figs.

9 and 10. A ratchet member 103 is keyed toV the shaft 81 and is provided with ratchet teeth 104 positioned for engagement by a paivl 105 pivotally mounted in a recess 106 in the continuously rotated gear 30.

Under normal conditions, the gear 80 drivesthe shaft 81 throughk engagement of the parel 105 with the teeth104 of the ratchet member 103. Frovisionis made, however, for rotating the Worin shaft 31 at a higher speed and when this occurs, the ratchet menibers 103 over-runs the paivl 105.

Theratchet memberV is provided With a springV 107 frictionally embracing said ratchet member and having its ends slightly separated as indicatedat 108 in Fig. 10. rlhe paivl 105 has a pin 109 which is received in the notch 108 inthe spring'107.

When the shaft 81 is rotated at a` higher speed than the gear 30, the spring 107 is 'the Worm shaft 81 but may be secured thereto by a friction clutch 113 controlled by a yoke arm 114 on a cross rod 115.

The rod 115 extends rearwardin the frame A, as indicated in Fig. 11,` and at its rear i end vis provided With an upwardly extending' arm 116 (Fig. 12), thev forked end of which is Apositioned between lock nuts 117011 a control rod 118. i rEhe: rod 118 extends axially in the frame A. and the right hand end of the rod,r as vieivedrin Fig. 11, engages a drum 120 on the carriage-actuating cam shaft 88 previously described.

lVhenever a cam lug or proj the drumk 120 engages therod118, the rod is -forced to the left against the pressure. of a spring 119, rocking the crossV rod 115 in an anti-clockwise direction, as vievvedl in Fig. 9, and thus disconnecting the high speed drive.y f

Similar cam lugs or ro'ections 122- Fien'V D p J b moving the tool slides `toward and from theA p The Worm shaft 31 (Fig. 9) iscon Vnected a swivel shaft 150 (Fig. 1) to a 6) mounted on a rear portion of the drum y120 engage an arm 123 on the shaft 67 previf ouslyde'scrib'ed and a spring` 124 (Fig. 7 holds the arm 123 in engagement With the drum 120. When the arm 123 is moved by the lug122, the arm 66 5) is correspond-A ingly `moved to Withdraw the clutch meinu ber 65 from the clutch member 64, thus causing the spindle 30t0 rotate at relatively slow speed. Y.

Stoppz'ng mechanism c The mechanism for automatically stopping the yoperation ofthe machine comprises a trip 130 4) ymounted on the cam 90 and positioned to engage and raise a plunger 1314 mounted in the casing or frame A and engaging an arm 132 on the cross shaft 50 to which the stopping handle 51. is secured. When the plunger is raised by the trip 130, the stopping` handle is depressed and the lock plate 47 is released as previously described, causing the machine to come to rest. A spring 133 on the plunger`131 seats the plunger inits bearing and quickly returns it to normal position, after being raised by the strip 130.

Tool'oorm'ago olm'no t rlhe tool carriage D is moved axially by the` pull rod 94 having the cam'roll bracket 93 clamped thereon, as previously described. The longitudinal position of the carriage may be adjusted by loosening the clamps of the bracket 93 and moving the carriage or rotating the cams to bring the pull rod 'and clannzis to a desired relation.A Further axial.

adjustment'of the tool carriage D may be accomplished by adjusting the clamps 140 and 141 (Fig. 1) on the pull rod 94'Which engage the carriage D at both sides thereof.

By spacing the vclamps orv collars 140 and 141 further apart than the Width of the carriage D, lost motion may be introduced and' the carriage D may be given a sliding motion end portion of the shaft 94 is prevented by extending the bracket 93 downward, as in dicated in Figs. 13 and 14, and by providing ection121 on" a guide block 143 at the lower Aend of the bracketvvhich guide block travels in av guide# Way on a recessed guide bar 144. The bracketv 93' and pull rod 94 are thnssecurely held from angular movement.

n Urosa feeding mechanism We Will novv Adescribe the mechanism for Work.

cross feed shaft 151 (Figs. 15 and 16). One ormoreivorms 152 are mounted-on the cross feed shaft 151, each Worm engaging a Worm Wheel 153'(Fig. 16) on a short shaft 154 rotatable in bearings in the tool carriage D and having a pinion 155 fixed thereto.l

rThe pinion 155 engages a gear 156 rotatbe desired.

able on a shaft 157 andhaving a drum 158 secured thereto. Cam plates 159 (Fignv17)V are secured to the drum 158 to give the tool slide 160 any desired movements toward and from theworlr, the tool slide being provided with a cam roll 161 engaging the camY plates 159. A spring plunger 162 is providedA for pressing the tool slide away from the work, and thus taking up any back-lashV between the cam plate 159 and the cam roll 161.

The drum shaft 157 is rotatable 'at its rear end in a bearing 163 in the tool carriage D and at the opposite end is supported in a sleeve 164 threaded into the casing of the car riage D. The shaft 157 is keyed to the sleeve 164 and the rear portion of the shaft is enlarged to provide a head for retaining the drum 158 on the shaft. A. thrust bearing 158@ may be lprovided between the drum 158 and the sleeve 164. End play of the shaft and drum may be taken up by check nuts 165 on the shaft 157. The front outer end of the shaft is flattened as indicated in Fig. 15 to receive a wrench or spanner.

By turning the shaft 157, the sleeve 164 is also turned in its threaded bearing and the shaft 157 and drum 158 may thus be moved axially for slight adjustment of the tool T toward or from the work. The outer end of the sleeve 164 may be graduated at 166 to co-operate with an index line 167 on the casing D, thus indicating the amount of radial adjustment of the tool T.

It will be understood that as many tool slides 160 may be provided upon the tool carriage as are found necessary for the particular type of work which the machine is designed to handle and a corresponding numberof worms 152, drums 158 and gear connections will be provided to actuate the different tool slides. The cam plates 159 may be varied for the dierent drums so that the tools may be advanced or withdrawn, either separately or simultaneously, as may General operation Having thus described the details of construction of our improved lathe, it is believed that the general operation thereof will be readily apparent. The lathe is designed particularly for producing large number of duplicate parts Vand for such purposes the cams 90 and 91 and the cam plates, 159 on the drums 158 may be specially designed for the work to be handled.

Assuming that the machine has been proand'122 (Figs. 6 and 11) will commonly be out of engagement with the rod 118 (Fig. 11) and the arm 123 (Fig. 6). i The clutch 113 (Fig. 9) will thus be engaged so that the worm shaft 81 will be rotated at high speed and will act through the cams 90 and 91 to move the tool carriage D rapidly A'to operative posiiion. kThe cams 90 and 91 may also be designed as to increase the relative speed at this point in the operation of the machine.

The clutch members 64 and 65 (Fig. 5) may at this time be set to rotate the spindle 30 at either high orlow speed. If it is then desired toV reduce the speed of the worm shaft 81 to-a lower cutting feed, the cam lug 121 (Fig. 11) may be set to engage the rod 118, disconnecting the clutche113 (Fig. 9) and permitting theA worm shaft 81 to be rotated in geared relation with the spindle 30.

If the clutch members 64 and 65 are engaged for lgh spindle speed and the heavyy portion of the cut is reach-ed or if for any other reason a slower speed is desired, the cam lug 122 (Fig. 6)may be positioned to engage the arm 123, disconnecting the clutch members 64 and 65 causing the spindle 30 and worm shaft 81 to be driven through the low speed gears 58 and 59 (Fig. 5).

At the end of the cut, the cam lug 121 will pass out from under the rod 118, permitting the tool carriage D to be returned to its inoperative position at high speed. The trip 130.(Fig. 4) then engages the plunger 131 and stops the machine.

If it is desired to stop the machine at any intermediate point, this may be easily done by using the stopping lever 51. Furthermore, if it isdesired to stop both the longitudinal and cross feed of the tool carriage, while continuing the rotation of the spindle, this may be done by movement of the handle 101 (Fig. 2) to cause separation of the clutch members 96 and 97 (Fig. 9).

It will thus be seen that we have provided mechanism for advancing and returning the tool carriage D at various. speeds, as well as for advancing and retracting the tool slides 160, all during the continued rotation of the work spindle 30 and work W in a single direction.

Obviously the cams 90 and 91 and the cam plates 159 may be designed to produce any desired operationson the work. By suitably designing the cams 90 and 91, the tool carriage may, if desired, be given a double transverse for a single rotation of the cams and the cam plates 159 may be designed to advance the tool first for a roughing cut during the first transverse andV then for a fin-1 ishing cut during the second traverse, all without stopping the machine and without reversing the rotation of the work spindle.

Many other useful combinations may be worked out by suitably designing the cams to cooperate to advance the tool toward Working position along the path of the dotted line i ainF ig. 3, thus substantially reducing theA time of operation and bringing the tool into engagement With the Work With the least possible delay. VJhile We have shownpthe lathe as of the horizontal ty 3e, therutility of our invention-,is not limited thereto, as many oit the features thereol'l are also of value in a lathe in Which the Workspindle is angularly or vertically disposed.

Having thus described our invention and the advantages thereof, We do not Wish to be limited to the details herein disclosed otherwise than as set forth in the claims, but what We claim is :V-

l. rIn a lathe, vin combination, a frame, a tool carriage slidable on said frame and supported thereby, a two-part pull rod for said carriage, means to adjust'one part of said pull rod With respect to the other part, means to adjust the entire pull rod with respect to said carriage, cam mechanism operatively conn-ected to move said rod and carriage, a Work spindle, automatic means to` move said spindle and cam mechanism in predetermined speed relation, and automatic means tovary said speedrelation.

2. In a lathe, in combination, a frame, af tool carriage slidable on said frame and supy ported thereby, a pull rod for said carriage, cams operatively connected to move said pull rod and carriage, a Work spindle, means to move said spindle and cams in predetermined speed relation, and means synchronized With said cams for varying said speed-relation.

3. In a lathe, in combination, a frame, a tool carriage slidable on said frame and supported thereby, a pull rod i'or said carriage, cam mechanism operatively connected to move said pull rod and carriage, a Work spindle, a main drive shaft, change speed vcennections between said main drive shaft and said spindle, means to drive said cam mechanism rin predetermined` speed relation to said spindle, and means synchronized-With said cam mechanism to vary said speed relation.

e. In a lathe, in combination, a frame, a

mechanism.operatively connected-to the other end ot' said shaft, a main shaftconnectedjto said change. speed Connection, a Werl; spindle, change speed connections between said main drive shaft and said spindle, meansto drivewsaid cam mechanism iii predeter'i'nined speed relation to said spindle, and means synchronized Wit-h said cam mechanism tovary said speed relation. l. v

. 5. In a lathe, in combinatioin, a tool carriage, a pull rod for said'carriage, cam mechat said higher speed.

anism operativelyconnected to 'move said vpullrod and carriage, a Work spindle, a

main drive shaft, change speed connections between said main drive shaft and said spindle, normally operating means to drive said cam mechanisniin predetermined speed re-V lation te said spindle, and additional means actuated in synchronism With said cam mechanism to dri Ve vsaid cam mechanism at a higher speed independent of said spindle speed, said normally operating means including an over-running clutch for connecting` said drive shaft to said cam mechanism, and said additional means Vincluding a clutch through Which said cam mechanism is actuated at high speedj l 6. In a lathe, incombinatiom-a tool carriage, a pull rod for said carriage, cammechanisni operatively connectedto move said' pull 'rod and carriage, a Work spindle, a main drive shaft, change speed connections betii'een said main drive shaft and said spindle, means to ldrive said rcam 'inechanismin predetermined speed relation yto said spindle', andadditienal means'actuated in synchro.- nism with said cam mechanism to drive said cam mechanism at a higher speed independent rof said spindle speed, said latter means including a clutch for connecting said additional driving means'to said cam mechanism,

and an automatic ymeans .controlling said clutch.

7. In a lathe, in combination, a Work spindie', a tool carriage,a pull rod for'said car-- riage, -cam mechanism operatively connected *i to move said pullkrodland carriage, said` cam mechanism "comprising ja cam having a drumrotatable therewitliivith cam portions thereon, and devices movable lby said cam portions to control thespeed'o said spindle and cam mechanism'and also to increase the speed of said cam'mechanism relative to said spindlespeed.k l f 8. In a lathe, in combination, atool carriage, a pull rod for said carriage, cam mechanism operatively connected to'move said pull rod and carriage, a Work spindle,

' meansto move said' spindle and cam mecha.-

nism in predetermined speed relation, and a give-Way device in the connections toV said cam mechanism, said device being also manualiy Voperable to step said cam mechanism While said Work spindle continues Vto rotate.

9.V In a lathe,'in combination, a tool carriage, a pull rod orsaid carriage, cam mechanisin operatively connected to move said pullrod and carriage, a'vvorlt spindle, `means. to move said spindle andV cam mechanism in predetermined speed relation, said means includingf a vratchet clutch, n and additional means to .drive said cam mechanism at a higher speed, With said clutch over-running l0. In a lathe, in combination, a tool Caranism operatively connected to v'move said pull rod and carriage, a Work spindle, means to moversaid spindle and cam mechanism in predetermined speed relation, a main drive shaft, a gear drive from said main shaft to said cam mechanism including a positive ratchet clutch, and a high speed belt drive between said main shaft and said cam mechanism, actuation by said belt drive running said camr mechanism at higher speed and causingsaid clutch to over-run.

11. In a lathe, in combination, a tool carriage, a pull rod for said carriage, cam mechanism operatively connected to move said pull rod and carriage, a Work spindle, a starting device for said lathe, a locking device for retaining said starting device in position, a rotatable cam in said cam mechanism,

and a trip on said cam effective to release said locking device and to thereby stop the lathe.

12j ln a lathe, a frame, a tool carriage slidable on said frame, a pnll rod for said carriage, a cam mechanism effective through said pull rod, to move said tool carriage axially of theframe, a tool slide on said car-- riage, a second cam mechanism on said carriage effective to move said tool slide toward and from the Work, and means to actuate said two cam mechanisms in definite speed relation'and means to'automatically vary said relation.

A 13. The combination in a lathe as set forth in claim 12, in which means is provided for y permittingV predetermined lost motion between the pull rodV and the carriage. Y 14. In a lathe, a tool carriage, a pull rod secured thereto, a cam roll xed on said pull *,rod, a pairof cams engaging said roll'on lopposite sides thereof, and means to simultaneously rotate said cams,

v15. ln a lathe, a tool carriage, a cam drum mounted therein, a tool slide movable toward and from the Work by said cam drum, a. bearing for said drum, and means to move said bearing to adjust said drum axially.

anism connected to'meve said carriage axially of the lathe, additional direct acting cam mechanism synchronized with said first mentioned mechanism for moving said slide toward and from the Work, a Werl; spindle, a main drive shaft for said cam mechanisms and said spindle, means to drive said spindle in predetermined speedirelation to said cam mechanisms, automatic deV rvices for changing the speed cf said spindle predetermined points in the cycle of operation of said calin mechanism. y

18. ln a lathe, in combination, a frame, a tool carriage slidabl-e en said frame and supported tlereby, a tool/slide transversely movable on said carriage, direct acting cam mechanism connected to move said carriage axially of the lat-he, additional direct acting` cam mechanism synchronized with said first mentioned mechanisin for moving said slide tovvard and from the Work, a Worlr spindle, a main drive shaft fer said cam mechanisms and said spindle, means to drive said spindle in predetermined speed relation to said cam mechanisms, automatic devices for changing the speed of said spindle atv predetermined points itie cycle of operation of said cam mechanisms, and automatic means for increasing the speed of Athe carriage actuating camsv during movement of the tool carriage in .one direction.

i9. ln a lathe, in combination, a frame, a tool carriage slidable on said frame and suppcrted thereby, a tool slide transversely movable pon said carriage, direct acting cam mechanism ccnnected to move said carriage axially of the lathe, additional directacting cam mechanism synchronized With said first mentioned mechanism for moving raid slide toward and from the Work, a Work spindle, a main drive shaft for said cam mechanisms and said spindle, means to drive said spindle in predetermined speed relation-to said cam mechanisms, automatic devices for changing` the speed of said spindle at predetermined points in the cycle of operation of said cam mechanisms, and automatic means for increasing and decreasing the speed of the carriage actuating cams during a single cycle of operation of the'mechanism.

20. In a lathe, in combination, a'frame, a tool carriage slidable on said frame and supported thereby, a tool slide transversely movable on said carriage, direct acting cam mechanism connected to move said carriage axially of the lathe, additional direct acting cam mechanism synchronized With said firstfmentioned mechanism for moving said slide to- Ward and from the Worlr, a Work spindle, a main'drive shaft for said cam mechanisms for said spindle, means to drive said spindle in predetermined speed relation to said cam mechanisms, automatic devices for changing the speed 'of said spindle at predetermined points in the cycle of operation of said cam mechanisms, and means for automatically stopping the lathe at a givenv point in the 0peration thereof.

21. In a lathe, in combination, a frame, a tool carriage slidable on said frame and supported thereby, a tool slide transversely movable on said carriage, direct acting cam mechanism connected to move said carriage axially of the lathe, additional direct acting cam mechanism synchronized with said first mentioned mechanism Vtor moving said slide toward and from the Work, a Work spindle, a main drive shaft for said cam mechanism-s and said spindle, means to drive said spindle in predetermined speed relation to said cam 22. 4In a lathe, in combination, a frame, a

- tool carriage slidable on said frame and supported thereby, a tool slidetransversely movable on saidcarriage, direct acting cam mechanism connectedto move said carriage aXially of the lathe, additional direct acting cam mechanism synchronized With said first mentioned mechanism forV moving said slide to- Ward and from the Work, a Work spindle, a main drive shaft for said cam mechanisms and for said spindle, means to drive said spindle in predetermined speed relationto said cam mechanisms, automatic devices for changing the speed of said spindle at `predetermined points in the cycle of operation of said cam mechanisms, means for automatically stopping the lathe at a given point in the operation thereof, means to start the operation of said lathe, means to lock said starting means, and means to unlock said starting means upon accidental obstruction to the movement of the tool carriage.

23. In a lathe, in combination, a-frame, a tool. carriage slidable on said frame and supported thereby, a tool slide transversely movable on said carriage, direct acting cam mechanism connected to move said carriage axially of the lathe, additional direct acting cam mechanism synchronized With said first mentioned mechanism for moving said slide toward and from the Work, a Work spindle, a main' drive shaft for said cam mechanisms and said spindle, means to drive said spindle in predetermined speed relation to said cam mechanisms, automatic devices for changing the speed of said spindle at predetermined points in the cycle of operation of said cam mechanisms, automatic means for increasing` the speed ofthe carriage actuating cams during movement of the tool carriage in one direction, means for automatically stopping the lathe at a given point lin the operation thereoi", means to start the operation of said lathe, means to lock said starting means, and means to unlocli said starting means upon accidental obstruction to the movement of the tool carriage.

2li. In a lathe, in combination, a frame, a

tool carriage slidable on said frame and supgiven point in the operaported thereby, a Workspindle, a main drive shaft for said carriage and said spindle, a pull rod for said carriage, cam mechanism operativelyV connected to move said pull rod and carriage, change speed connections betvveen said main shaftand cam mechanism and betvveensaid ymain shaft and spindle, means to move said cam mechanism and spindle in` predetermined speed relation, and means associated with said cam mechanism for actuating said rchange speed connections thereby tovary said speed relation.

In testimony whereof We have hereunto af- I iixed our signatures. 7

EDWIN R. SMITH. RICHARD A. ASHTON. 

